java - 从广播接收器 android 调用 Activity 警报框

Question

我有一个可以启动广播的应用程序。如果应用程序正在运行，我想显示一个弹出窗口，无论我在哪个 Activity 上，如果没有运行，则推送通知

这是我的代码

public class AlarmReceiver extends BroadcastReceiver
{
    private static int NOTIFICATION_ID = 1;
    private NotificationManager mNotificationManager;

     @Override
     public void onReceive(final Context ctx, Intent intent) 
     {
         if (isRunning(ctx))
         {
            Intent myIntent = new Intent (ctx, NotifyTagabilityCounter.class);
            myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            ctx.startActivity(myIntent);
         }
         else
         {
             mNotificationManager = (NotificationManager)
                      ctx.getSystemService(Context.NOTIFICATION_SERVICE);

             Intent i = new Intent(ctx, Game.class);
             i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
             i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
             i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
             i.putExtra(Constants.TAG_TIMESTAMP, true);
             PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0,
                  i, PendingIntent.FLAG_CANCEL_CURRENT);      

             NotificationCompat.Builder mBuilder =
                  new NotificationCompat.Builder(ctx)
                  .setSmallIcon(R.drawable.launcher)

             Notification notification = mBuilder.getNotification();
             notification.flags = Notification.FLAG_AUTO_CANCEL;

             mBuilder.setContentIntent(contentIntent);
             mNotificationManager.notify(NOTIFICATION_ID, notification);

             SharedPreferences customSharedPreference = ctx.getSharedPreferences(
                     "UserSharedPrefs", Activity.MODE_PRIVATE);

            SharedPreferences.Editor editor = customSharedPreference.edit();
            editor.putBoolean(Constants.TAG_NOTIFICATION, true);
            editor.commit();
         }
     }

     public boolean isRunning(Context ctx) 
     {
            ActivityManager activityManager = (ActivityManager)  ctx.getSystemService(Context.ACTIVITY_SERVICE);
            List<RunningTaskInfo> tasks =  activityManager.getRunningTasks(Integer.MAX_VALUE);

            for (RunningTaskInfo task : tasks) 
            {
                if (ctx.getPackageName().equalsIgnoreCase(
                                         task.baseActivity.getPackageName())) 
                    return true;                                  
            }

            return false;
        }

创建新 Activity NotificyTagabilityCounter

ublic class NotifyTagabilityCounter extends Activity
{
    public static final int NOTIFICATION_ID_RECEIVED = 0x1221;
    static final String ACTION = "com.trib.broadcast";

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        IntentFilter filter = new IntentFilter(ACTION);
        this.registerReceiver(mReceivedReceiver, filter);
    }

private final BroadcastReceiver mReceivedReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (ACTION.equals(action)) 
            {
                displayAlert();
            }
        }
    };    

我得到的只是黑屏。我希望显示我的最后一个 Activity ，并在其顶部显示一个弹出式 AlertDisplay。这怎么能做到..？

Answer 1

要做到这一点:
1-定义两个BroadcastReceivers list 中的第一个优先级较低，应用程序(运行时)中每个 Activity 中的第二个优先级较高。
第一名BroadcastReceivers应显示通知
第二次广播应该 abort()广播并显示对话框。

2-发送有序广播。

PS:您可以创建一个扩展 Activity 的 BaseActivtiy，并在其上定义第二个广播(不要忘记在 onStart() 和 onStop() 中注册和取消注册广播)，
然后让你的所有 Activity 都扩展 BaseActivtiy